Back firing and sputtering - Road Star Warrior Forum : Yamaha Star Warrior Forums

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Old 11-09-2019, 11:41 PM   #1 (permalink)
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Default Back firing and sputtering

I'm out riding and the warrior started to sputter and lose power...
Some back firing and rough running

No engine codes or check engine light on.


I'm on the road trying to limp the warrior home

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Old 11-10-2019, 12:08 AM   #2 (permalink)
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Check the battery cables are tight. Had mine have similar issues and that was the cause.

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Old 11-10-2019, 03:12 AM   #3 (permalink)
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Just got home.Had to push the warrior for about a block.

[email protected] thing is FREAKING heavy......

So UPDATE...

while riding on the freeway had the warrior WOT and wouldn't go pass 70mph...

And RPMS @ 2500 .....

When I got it home I was able to start it..
And still running rough n sputtering

Touch the Exshaust rear pipe HOT..

Front Exshaust kinda warm...only...



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Old 11-10-2019, 03:49 AM   #4 (permalink)
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Quote:
Originally Posted by Desertboy13 View Post
Just got home.Had to push the warrior for about a block.

[email protected] thing is FREAKING heavy......

So UPDATE...

while riding on the freeway had the warrior WOT and wouldn't go pass 70mph...

And RPMS @ 2500 .....

When I got it home I was able to start it..
And still running rough n sputtering

Touch the Exshaust rear pipe HOT..

Front Exshaust kinda warm...only...



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Make sure the front plug wires are connected on the spark plugs all the way.
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Old 11-10-2019, 04:13 AM   #5 (permalink)
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Since one pipe is hot and the other just warm, Fuel or spark seems like the issue.

Fuel-
Loose ground for the fuel tuner.
Loose fuel injector connector from the fuel tuner.
Clogged fuel injector.

Spark-
Loose battery connections.
loose spark plug wires on the spark plugs.
Loose coil connector feed wires.
Bad spark plug.
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Old 11-10-2019, 05:29 AM   #6 (permalink)
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had the exact same symptoms on my previous bike a couple of times... both times one of the ignition coils was busted and had to be replaced..
so 1st thing i'd check is if all plugs will spark.
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Old 11-10-2019, 08:07 AM   #7 (permalink)
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Additionally, check if your fuel map corrupted and is running super-lean on one jug. Check your CPS. And check your dry breaks and the vent hose under the tank for kinking. Pull the offending Jug's injector. That's all I can think of.
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Old 11-10-2019, 10:22 AM   #8 (permalink)
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As stated check the primary coil wires they face front & collect moisture. Pull each female spade connector & crimp it a bit for a tight connection. Do one @ a time the coils are polarity sensitive. If you mix them up look inside the coil towers they are marked + & -
key on power wire goes on the + terminal.
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Old 11-10-2019, 10:51 AM   #9 (permalink)
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Thnks guys....
That's what I figured that had 2 be done...

Just last night on the road and trying to get the warrior home wasn't thinking...

I'll post what I come up with.

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Old 11-17-2019, 12:18 AM   #10 (permalink)
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Well back at it again...

Went over everything on Thursday and took a ride and all was good
Until now getting off the freeway and it started up running like b4....



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